<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>xmind</title>
</head>
<body>
    <button id="test">121212</button>
    <button id="enlarge">enlarge</button>
    <button id="narrow">narrow</button>
    <div id="xmind"></div>
</body>
</html>